Sixteen-slice computed tomography scan revealed the middle lobe of right lung was detected atelectasis in lung window because of compression from enlarged esophagus, and upper esophagus expanded obviously [Figure 1]d, lower esophagus and cardia became significantly narrow and mucous membrane around of this area also was thick in soft tissue window.

We wished to determine if there was a significant difference between the measurements of compressed airway diameter in the axial plane compared with measurements of diameter using MPR for determining longitudinal axis of the airway; and to evaluate how measurements on lung window settings compare with soft tissue window settings.

All measurements were performed both in soft tissue window (Window 350/Level 50) and lung window (Window 1600/Level 500) settings (Figs 1C and 1D).

Radiologists can configure a single viewing protocol for a CT abdomen and pelvis, for example, with their choice of a variety of different views: View 1) Soft tissue window presets, View 2) Lung window presents, 3) Bone window presents, Views 4-6) The preceding windows, but with prior studies added.

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